I've been a Paypal user since 2005 and have never had a problem with them. I've use this service for it's convenience. I've heard lots of bad stories here and there, but now it happened to me, I feel for others frustration.
I'm a Verified Premium User. I've been making payments in amounts even higher than the $2,100 I was trying to pay.
I have to make 3 small payments in a span of 3 days just to make the amount needed. It really sucks and no amount of complaining made Paypal solve the problem. Paypal's resolution was to offer me excuses upon excuses but no real help for my issue.
In the future, I'll avoid using Paypal as much as possible.
Paypal is a credit card vendor. I'm thinking it's a security issue - nothing personal on you, and probably won't happen too often. They probably have you on some sort of a limit - not per transaction but overall for a time period - say $3,000 per month or $2000 per week, something like that.
They are at risk for each purchase made on a credit card - a risk that if the credit card company or bank doesn't pay them because of a default, then they hold the bag for the loss. They consider each credit card paid sale as extending credit. Why? It's complicated, but basically they are left holding the bag for any chargeback they can't collect on. The fee they collect - $60 on a $2000 sale, is nothing compared to losing $2000 due to a credit card default.
A few years ago, every once in a while, for security purposes, I know they wouldn't let me use a credit card on one specific random transaction for some reason. They denied me a credit card purchase for a few thousand (it had nothing to do with the credit card and I had several to choose from) and they would only accept a bank transfer. Once that came up in that one transaction - that was it - it would not take the credit card no matter who I yelled at. I could pay by credit card for other transactions, but not the one that was denied.
Paypal is a great service but it's not without its foibles. It's hard for us to understand the credit card vendor principles - but basically they are trying to manage their exposure to credit card losses.
Chris